| Karim Belabas on Sat, 20 Dec 2008 19:25:12 +0100 |
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| Re: Functions elllderiv and ellanalyticrank |
* Bill Allombert [2008-12-20 16:39]:
> On Sat, Dec 20, 2008 at 10:16:23AM +0100, Karim Belabas wrote:
> > * Bill Allombert [2008-12-19 23:20]:
> > > Also the DEBUG message should be improved to be more useful.
> >
> > Done to some extent, I think. More specific suggestions (svn11475 and above) ?
>
> I'd like timing of each ellL1 computation done by ellanalyticrank
> separately.
Done.
> With \p38, ellanalytic rank fails on a large number (about 1/3 so far)
> of rank 5 curve in Womack database (it reports rank 1 instead of 5).
>
> An example: [0, 0, 0, -5187, 176830]
> ? \p38
> realprecision = 38 significant digits
> ? ellanalyticrank(ellinit([0, 0, 0, -5187, 176830]))
> %102 = [1, 1278372.8304848296806080373284485378614]
[...]
> Clearly the value L'(1) is worng (independently of the rank of the curve).
Fixed since svn-11480 (the an cache should have been initialized to 0).
Thanks !
K.B.
--
Karim Belabas, IMB (UMR 5251) Tel: (+33) (0)5 40 00 26 17
Universite Bordeaux 1 Fax: (+33) (0)5 40 00 69 50
351, cours de la Liberation http://www.math.u-bordeaux.fr/~belabas/
F-33405 Talence (France) http://pari.math.u-bordeaux.fr/ [PARI/GP]
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